Web Reference: In a situation where a C/TPA has notified an owner/operator or other individual employee to report for testing (other than for a pre-employment test) and the employee does not appear, the C/TPA must determine whether the employee has refused to test (see §§ 40.191 (a) (1) and 40.355 (j)). Some of the dependencies I'm using won't compile without a lot of work in gcc version >= 4.0.1, so I'm stuck with using good old fashioned C-style callbacks, which work just fine. You can use callbacks to let a function behave differently depending on which function you pass in. This is common in sorting, filtering, and event-handling code.
YouTube Excerpt: In this video we will be learning how to implement
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